Kidney biopsy (Percutaneous renal (kidney) biopsy)
A test in which a fine needle is used, guided by ultrasound, to take a tiny sample of kidney tissue so it can be examined under a microscope to find the cause of a kidney problem.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- A kidney biopsy takes a tiny tissue sample with a needle to find the cause of a kidney problem or to guide treatment.
- The main risk is bleeding; serious bleeding is uncommon but is the reason for careful monitoring afterwards.
- It is a day-case procedure under local anaesthetic, but you lie flat for several hours and avoid heavy activity for 1–2 weeks.
- Ask why the biopsy is needed, what it will change, and what your bleeding risk is — and how any blood thinners you take will be managed.
A plain-English summary. The detail — including risks and recovery — is below.
At a glance
A general guide. Your specialist will give you advice for your situation.
Can find the specific cause of a kidney problem when blood and urine tests cannot
An uncorrected bleeding tendency or clotting problem, until it is treated.
You lie flat in bed, often for around 6 hours, while your pulse, blood pressure and urine are checked. Some blood in the urine at this stage is common.
A defined monitoring period with regular pulse, blood pressure and urine checks.
You lie flat in bed, often for around 6 hours, while your pulse, blood pressure and urine are checked. Some blood...
If observations are stable and there is no concerning bleeding, you usually go home with someone to take you. Some...
Rest at home and avoid lifting or straining. Do not drive for at least 24 hours. Mild aching at the site is normal.
Avoid heavy lifting, contact sport and strenuous exercise. Most people return to desk work within a day or two if...
What is a kidney biopsy?
A kidney biopsy is a minor procedure in which a doctor uses a fine needle, guided by an ultrasound scanner, to take one or more tiny samples of kidney tissue. The samples are about half the length of a matchstick and do not affect how the kidney works. A specialist then examines them under a microscope.
It is usually done to find out why blood or urine tests suggest a kidney problem — for example protein or blood in the urine, or kidney function that is falling for reasons that are not clear. It can also show how active or advanced a kidney condition is, and whether a treatment is working.
A biopsy can give information that no blood test or scan can, but it is not done lightly: the main risk is bleeding, because the kidneys have a rich blood supply. Most biopsies cause no serious problem, but you will be watched carefully afterwards.
This guide describes a biopsy of your own (native) kidneys. A biopsy of a transplanted kidney is similar but managed by the transplant team.
Types, options & approaches
There may be different ways to do this. The right approach depends on the clinical question and your circumstances.
Options at a glance
These are the main approaches described in this guide. The right option depends on the diagnosis, your goals and what your clinician thinks is safe.
Ultrasound-guided native kidney biopsy
The usual approach. An ultrasound scanner locates the kidney and guides a fine needle through the skin of the back to take samples. Most biopsies in adults are done this way.
CT-guided biopsy
A CT scanner is used to guide the needle when the kidney is hard to see on ultrasound, or where the anatomy is unusual.
Transplant kidney biopsy
A biopsy of a transplanted kidney, which sits lower in the body. It is used to check for rejection or other problems and is managed by the transplant team.
Transjugular kidney biopsy
An uncommon approach, done through a vein in the neck by a radiologist, used for selected people at higher risk of bleeding or who cannot lie face down.
Preparing for your procedure
- You will usually have blood tests beforehand to check your blood count and how well your blood clots, and your blood pressure will be checked.
- Tell the team about all your medicines, especially blood thinners such as warfarin, aspirin, clopidogrel, apixaban, rivaroxaban, edoxaban or dabigatran. Some people need a temporary change before this procedure, but the plan differs by medicine, the exact procedure and their risk of bleeding or blood clots. Do not stop, skip or restart any of these medicines unless the team responsible for your procedure gives you specific instructions.
- Mention any bleeding tendency, high blood pressure, or having only one working kidney.
- Ask whether you can eat beforehand; a light meal is often allowed, as you will lie flat afterwards.
- Arrange for someone to take you home and, ideally, stay with you that night, as you should not drive for at least 24 hours.
- Plan for a day or two off work and to avoid heavy lifting and sport for 1–2 weeks.
- If you might be pregnant, tell the team, as this affects whether and how the biopsy is done.
What happens
You usually lie on your front. The doctor uses an ultrasound scanner to find the best spot, cleans the skin with antiseptic and injects local anaesthetic to numb the skin and the path down to the kidney. A small nick is made in the skin.
Under ultrasound guidance, a fine biopsy needle is passed in to take a sample. Because the kidneys move as you breathe, you will be asked to hold your breath for a few seconds while each sample is taken. You may hear a clicking sound as the needle takes the sample, and two or three samples are often needed. The procedure itself usually takes about 30 minutes.
Afterwards a dressing is applied and you are taken to lie flat in bed. Your pulse and blood pressure are checked regularly and your urine is watched for blood, because the first hours are when bleeding is most likely to show.
Is this procedure right for me?
A good consultation should explore whether it's the right choice for you now — including reasons to wait or consider something else.
May not be suitable if…
- An uncorrected bleeding tendency or clotting problem, until it is treated.
- Uncontrolled high blood pressure, which raises bleeding risk and is usually controlled first.
- Active kidney or surrounding infection, which is usually treated before a biopsy.
- A single working kidney or certain anatomical problems, where the risks and approach need special consideration.
- Situations where the result would not change management, so the risk is not justified.
Delay or rearrange if…
- You are taking blood thinners that have not yet been safely stopped.
- Your blood pressure is high and not yet controlled.
- You have an active urinary or other infection.
- You cannot lie still or hold your breath as needed, until this can be managed.
- Pregnancy is possible or confirmed, which changes whether and how the biopsy is done.
Alternatives to discuss
- Continued blood and urine testing and imaging if a diagnosis can be reached without biopsy.
- Empirical treatment in selected situations where the likely diagnosis is clear, after weighing the risks.
- A transjugular (through the neck) biopsy for people at higher bleeding risk or who cannot lie prone.
- Watchful monitoring if kidney function is stable and the result would not change treatment.
Before you decide
Use this as a shared-decision checklist. The aim is not just “can this be done?”, but whether it is right for you, now, with the risks and alternatives clearly understood.
What matters most to me?
Think about symptoms, daily life, work, caring responsibilities, sport, fertility, travel, appearance and anxiety — the right choice depends on your priorities, not just the medical facts.
What are all my options?
Ask about waiting, monitoring, medicines, rehabilitation, a smaller or larger procedure, a different test, NHS referral, or a second opinion where that would help.
What would make me pause?
Active infection, pregnancy, unstable medical problems, smoking, medicines that increase bleeding, poor support at home, or feeling pressured are all reasons to slow down and get tailored advice.
What happens if I do nothing today?
For some problems, waiting is safe; for others, delay can make treatment harder. A good consultation should explain the trade-off in plain English.
Comfort, sedation or contrast choices
If local anaesthetic, sedation, contrast or pain relief is used, ask what is planned, why, and what it means afterwards.
Benefits
- Can find the specific cause of a kidney problem when blood and urine tests cannot
- Shows how active or advanced a kidney condition is
- Guides which treatment is likely to help, and how strong it needs to be
- Can show whether a current treatment is working or causing harm
- Helps avoid strong treatments, such as immune-suppressing drugs, when they are not needed
- Provides information that can change the whole direction of your care
Risks & complications
- Some blood in the urine in the first day, which usually clears on its own
- Bruising, soreness or aching at the biopsy site for a few days
- Needing to lie flat for several hours, which some people find uncomfortable
- A small bruise (haematoma) around the kidney that causes no lasting problem
- Heavier bleeding that needs a blood transfusion
- An inadequate sample, meaning the biopsy may need repeating
- Bleeding that needs a procedure (embolisation) to seal the bleeding vessel
- Pain needing stronger pain relief
- Severe bleeding needing an operation, very rarely including removing the kidney
- Injury to nearby structures
- Infection
- Death — very rare
The main risk of a kidney biopsy is bleeding, because the kidneys have a rich blood supply. This is why any blood thinners are managed carefully beforehand, your clotting and blood pressure are checked, and you are watched closely afterwards. Risk is higher if you have poor kidney function, a low blood count, uncontrolled high blood pressure or a single kidney. Ask the team about your personal risk and how bleeding would be managed.
Published figures to discuss
Kidney biopsy is usually safe, but bleeding is the key risk and the reason for careful checks beforehand and monitoring afterwards. Reported rates vary with the patient (kidney function, blood count, blood pressure), the needle and the operator. The figures below combine UK NHS patient information with published meta-analyses, and are cautious ranges rather than guarantees for any individual.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Visible blood in the urine after biopsy | Around 1 in 20 (about 5%) or less; usually settles within a day | Common and usually self-limiting; heavy or persistent bleeding is the concern. | Corapi et al. — Bleeding complications of native kidney biopsy: systematic review and meta-analysis (PubMed)pubmed.ncbi.nlm.nih.govPublished figure |
| Bleeding needing a blood transfusion | Roughly 1 in 100 in NHS patient information; meta-analysis estimates around 0.9–1.6% | More likely with poor kidney function, low blood count or high blood pressure. | Guy's and St Thomas' NHS FT — Kidney biopsyguysandstthomas.nhs.ukPublished figure |
| Bleeding needing a procedure to seal a vessel (embolisation) | Broadly around 0.3–0.6% in published series | An X-ray-guided procedure used to stop bleeding without open surgery. | Corapi et al. — Bleeding complications of native kidney biopsy: systematic review and meta-analysis (PubMed)pubmed.ncbi.nlm.nih.govPublished figure |
| Inadequate sample requiring repeat biopsy | Roughly 1 in 50 (about 2%) or less in patient information | Depends on the tissue obtained and the condition being investigated. | Corapi et al. — Bleeding complications of native kidney biopsy: systematic review and meta-analysis (PubMed)pubmed.ncbi.nlm.nih.govPublished figure |
| Severe bleeding needing surgery, including kidney removal | Very rare, on the order of 1 in 1,000 or less | An uncommon worst case; death is rarer still, well below 1 in 1,000. | Corapi et al. — Bleeding complications of native kidney biopsy: systematic review and meta-analysis (PubMed)pubmed.ncbi.nlm.nih.govPublished figure |
These are literature figures, not a personalised prediction. Your own risks and likely benefits depend on your circumstances, your health, and how your care is carried out and followed up.
What happens afterwards
After the biopsy you lie flat for several hours so the puncture site can settle, while staff monitor for bleeding. Most people go home the same day and feel back to normal within a couple of days, but heavy activity is avoided for one to two weeks.
- A small amount of blood in the urine in the first day, settling on its own
- Aching or soreness at the biopsy site for a few days
- Some bruising of the skin on the back
- Tiredness after lying still for several hours
- Mild discomfort eased by paracetamol (not anti-inflammatory painkillers, which are usually avoided in kidney patients)
Aftercare
- Rest and avoid heavy lifting, bending and straining for the time advised, usually 1–2 weeks.
- Drink normally unless told otherwise, which helps keep the urine clear.
- Use paracetamol for discomfort and avoid anti-inflammatory painkillers (such as ibuprofen) unless your kidney team approves them.
- Do not drive for at least 24 hours, and follow advice on returning to work.
- Only restart blood thinners when your team tells you it is safe.
- Watch your urine: a small amount of blood is expected, but heavy bleeding or clots need urgent review.
- Keep your follow-up appointment to get your results and plan the next steps.
- Someone to take you home and ideally stay overnight
- Time off work arranged (usually a day or two)
- Confirmation of the plan for your blood thinners, including when to restart them
- Paracetamol at home (and a note to avoid anti-inflammatory painkillers)
- A clear list of warning signs and an out-of-hours contact number
- No heavy lifting, sport or strenuous activity planned for 1–2 weeks
- A date for the follow-up appointment to get results
Scars and how they heal
A kidney biopsy is done through a needle, so there is no surgical cut and no stitches. You are left with a tiny puncture mark on the skin of the back, usually covered with a small dressing, which heals to little or no visible mark. Bruising around the puncture site is common and fades over a week or two. Aching at the site is normal for a few days. There is no large scar, but the puncture does go through skin and into the kidney, which is why bleeding is the main risk to watch for.
⚠ Get urgent help if…
- Heavy or bright-red blood in the urine, or passing blood clots
- Severe or worsening pain in the back, side or tummy
- Feeling faint, dizzy, very pale, or having a racing heartbeat (possible signs of bleeding)
- Being unable to pass urine
- Fever, chills or feeling generally unwell (possible infection)
- Swelling, spreading redness or discharge at the biopsy site
- Shortness of breath or chest pain — call 999
Who to contact: your clinician, clinic or test provider first (keep their number to hand). For urgent advice when you can't reach them, call NHS 111. In an emergency, call 999.
General guidance — it doesn't replace the specific advice your specialist gives you.
Results & realistic expectations
A useful biopsy gives the specialist enough good-quality tissue to identify the cause of your kidney problem, judge how active or advanced it is, and guide treatment. Occasionally the sample does not contain enough kidney tissue and the biopsy has to be repeated.
Results usually take a week or more, because the tissue is processed and examined in several ways, and are normally explained at a clinic appointment. A biopsy is very informative, but it shows one small piece of one kidney at one moment, so it is interpreted alongside your blood and urine tests and your overall picture. It cannot predict exactly how your kidneys will behave in the future.
A biopsy is a snapshot in time. It can confirm a diagnosis and guide treatment, but kidney conditions can change, so further blood and urine tests are used to follow how things progress. In some conditions a repeat biopsy is considered later if the situation changes or to check the response to treatment. Your team will explain whether ongoing monitoring or a future biopsy is likely.
Related tests, treatments or support
A kidney biopsy is usually one part of a wider assessment that includes blood tests (such as kidney function and immune tests), urine tests, and a kidney ultrasound to check the size, number and position of the kidneys before the biopsy. The biopsy result is read together with all of these rather than on its own.
Follow-up & long-term care
You will normally be given a clinic appointment to receive and discuss your results, usually a week or more after the biopsy, and to agree the next steps — which may be treatment, monitoring, or referral. Before then, you should have a clear contact route in case of bleeding or other warning signs. Make sure you know who to call and when your results are due.
- Regular blood and urine tests to monitor kidney function over time
- Blood pressure control, which protects the kidneys
- Medication monitoring if treatment is started after the biopsy
- A possible repeat biopsy in selected conditions to reassess or check treatment response
Repeat, follow-on and what comes next
- If the sample does not contain enough kidney tissue, the biopsy may need repeating.
- A repeat biopsy is sometimes planned later to reassess a condition or check treatment response.
- Bleeding occasionally needs a further procedure (embolisation) or, very rarely, surgery.
- Results are read alongside blood and urine tests, which continue afterwards.
Ask what happens if the result is unclear or needs repeating, and what is included if further tests or follow-up are needed.
What good aftercare looks like
- A defined monitoring period with regular pulse, blood pressure and urine checks.
- Clear written warning signs and a 24-hour contact route for bleeding.
- Explicit instructions on activity, driving and restarting blood thinners.
- A booked follow-up appointment to receive and act on the results.
- A plan for who manages any complication and how you would access emergency care.
What affects the cost
Costs vary a great deal between people and providers, and we don't publish prices. What matters is understanding what drives the cost and making sure your quote is complete. The main things that affect it:
- Whether the biopsy is guided by ultrasound or CT, and who performs it
- The facility and day-case or overnight stay, including the monitoring period afterwards
- Pre-biopsy blood tests and any clotting or blood-pressure assessments
- Laboratory processing and specialist (pathology) examination of the tissue
- Any need to manage and later restart blood-thinning medicines
- Follow-up appointments to receive and act on the results
- The operator and facility fees, including the post-procedure monitoring period
- Whether laboratory and pathology reporting is included
- Pre-biopsy blood tests and management of blood thinners
- What happens, and what it costs, if the sample is inadequate and a repeat is needed
- How bleeding or other complications would be managed and whether that is covered
- Follow-up appointment to discuss results
- What happens if you need emergency care or transfer into NHS care
On the NHS? A kidney biopsy is routinely available on the NHS when clinically indicated; private access is sometimes used for speed, but the procedure and the monitoring afterwards are the same.
You're entitled to your total cost in writing — including reports, follow-up and what happens if the result is inconclusive — before you decide.
Consent traps and marketing red flags
These are not small details. They are often where patients lose choice, time to reflect, or realistic expectations.
Consent traps
- Not being told that bleeding is the main risk, or how it would be managed.
- Blood thinners not reviewed and stopped appropriately before the biopsy.
- No clear plan for restarting blood thinners afterwards.
- No written warning signs or out-of-hours contact for bleeding.
- Not being told the sample can occasionally be inadequate and need repeating.
Marketing red flags
- Describing a kidney biopsy as 'quick and simple' without explaining the bleeding risk.
- Offering a biopsy without proper blood-clotting and blood-pressure checks first.
- Not arranging an adequate monitoring period or overnight option after the procedure.
- Promising results far faster than tissue processing realistically allows.
- No clear pathway for managing bleeding or transferring to emergency care.
Choosing a specialist safely
- Check the specialist is on the GMC Specialist Register for this area.
- Make sure they work at a CQC-registered service, and look for membership of the relevant Royal College or professional body.
- You're entitled to time to consider and to have your questions answered before you agree — the specialist who looks after you should explain it, not a salesperson.
- Be wary of pressure: time-limited offers or deposits taken before you've had time to think are red flags, not bargains.
- You're entitled to your total cost in writing — including any follow-up — before you decide.
Questions to ask your medical professional
Take this to your consultation. A good specialist will welcome every one of these.
- Why do I need a biopsy, and what will the result change about my treatment?
- What is my personal risk of bleeding, and how would bleeding be managed?
- How will my blood thinners be managed before the biopsy, and when can I restart them?
- Will it be guided by ultrasound or CT, and who will perform it?
- How long will I need to lie flat, and will I go home the same day or stay overnight?
- What should I do, and who should I call, if I see heavy bleeding afterwards?
- What happens if the sample does not contain enough tissue?
- Are you on the GMC Specialist Register for this area, and which Royal College or professional body are you a member of?
- Will you be the specialist who carries out my procedure, and who looks after me afterwards?
- What are the risks for someone like me, and how often do your own patients have a problem or need it repeated or redone?
- What does a realistic result look like — and what can this procedure not achieve?
- What are my options, including waiting, doing nothing for now, or choosing a different approach?
- Can I have written information, results and aftercare instructions in a format I can use, including any accessibility or communication support I need?
- What is the total cost in writing, including any follow-ups, and how much time do I have to decide?
Frequently asked questions
Will a kidney biopsy hurt?
How dangerous is the bleeding risk?
Why do I have to lie flat for so long?
Do I have to stop my blood thinners?
When will I get my results?
Can I have a kidney biopsy on the NHS?
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How we made this page
Medically reviewed by a GMC-registered consultant. Written in plain English, checked against NHS, NICE, GMC and relevant Royal College / specialist-society guidance, and kept under review. No clinic paid to appear on this page, and we publish no pricing. This is general information to help you prepare — it is not a substitute for advice from your own clinician. How we review our guides →
Source hierarchy: UK regulator and NHS/NICE guidance first, then relevant Royal College or specialist-society guidance, then peer-reviewed evidence for procedure-specific figures where available.
Sources & standards: Kidney Care UK — Kidney biopsy Guy's and St Thomas' NHS FT — Kidney biopsy Hull University Teaching Hospitals NHS Trust — Having a kidney biopsy (complication rates) Corapi et al. — Bleeding complications of native kidney biopsy: systematic review and meta-analysis (PubMed) Complications of percutaneous renal biopsy — PMC review UK Kidney Association — information resources
Reviews reflect patients' experience of care, not clinical outcomes. For procedure volumes and outcome data see PHIN.
Last medically reviewed 2026-09-21. Spotted something wrong or out of date? Report an error in this guide.
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